Posts by admin | Nikolay Nikolov blog

RabbitMQ Work Queue with Symfony

Add to .env

RABBITMQ_HOST=localhost
RABBITMQ_PORT=5672
RABBITMQ_USERNAME=test
RABBITMQ_PASSWORD=test
RABBITMQ_QUEUE_NAME=task_queue

Add to services.yaml

App\Command\WorkerCommand:
        arguments: ['%env(RABBITMQ_HOST)%', '%env(RABBITMQ_PORT)%', '%env(RABBITMQ_USERNAME)%', '%env(RABBITMQ_PASSWORD)%', '%env(RABBITMQ_QUEUE_NAME)%']

    App\Command\PublisherCommand:
            arguments: ['%env(RABBITMQ_HOST)%', '%env(RABBITMQ_PORT)%', '%env(RABBITMQ_USERNAME)%', '%env(RABBITMQ_PASSWORD)%', '%env(RABBITMQ_QUEUE_NAME)%']

Continue reading “RabbitMQ Work Queue with Symfony” »

Setting up RabbitMQ

First, we need to use composer to install RabbitMQ Server and the PHP package for interfacing with RabbitMQ.

composer require php-amqplib/php-amqplib

sudo apt-key adv --keyserver "hkps.pool.sks-keyservers.net" --recv-keys "0x6B73A36E6026DFCA"
wget -O - "https://github.com/rabbitmq/signing-keys/releases/download/2.0/rabbitmq-release-signing-key.asc" | sudo apt-key add -
sudo apt-get install apt-transport-https
sudo apt-get update -y
sudo apt-get install -y erlang
sudo apt-get update
sudo apt-cache policy
sudo apt-get install -y rabbitmq-server

Create user for rabbitMQ and set permissions
only root can create user

sudo su root 
rabbitmqctl add_user test test
rabbitmqctl set_user_tags test administrator
rabbitmqctl set_permissions -p / test ".*" ".*" ".*"

You can now reach RabbitMQ interface at http://localhost:15672

MongoDB first steps

Simple commands you should know!

Continue reading “MongoDB first steps” »

Array to XML in Symfony

Simple example how to convert Array to XML:

public function toXML() {
    $array = [
      'fields' => [
        'field' => [
          '@name' => 'name',
          '@test' => 'test',
          '#' => 12345
        ]
      ]
    ];

    $xmlEncoder = new XmlEncoder();

    $response = new Response();
    $response->setContent($xmlEncoder->encode($array, 'xml'));
    $response->headers->set('Content-Type', 'xml');
    return $response;
  }

Change cache directory in Symfony

This task is really simple. You can achieve it from Kernel.php, getCacheDir method:

 public function getCacheDir()
    {
//        return $this->getProjectDir().'/var/cache/'.$this->environment; //Any location on your server
        return '/dev/shm/'.$this->environment; //This will cache in RAM
    }

Use Redis in Symfony

Install redis server:

sudo apt-get install redis-server

Copy backup configuration file:

sudo cp /etc/redis/redis.conf /etc/redis/redis.conf.default

Check if redis is installed correctly by:

redis-cli

Continue reading “Use Redis in Symfony” »

Problem with NULL values you should remember

When trying to execute SELECT OR UPDATE query for rows different than a specific value, we should be aware to insert additional statement for null values too.

For Example:

        UPDATE account_event 
        SET account_event.assigned_to_id = 2 
        WHERE account_event.status != 1

With this query your goal is to update all rows where account_event.status is different from 1. But if status have null value it wont be updated!
In MySQL all null elements are skipped from comparison and will never be Selected or Updated.

When you have a null fields you should always add additional statement for null like this:

        UPDATE account_event 
        SET account_event.assigned_to_id = 2 
        WHERE account_event.status != 1 
        OR account_event.status IS NULL

Vagrant – setup LAMP container

Install Vagrant and VirtualBox.

Go to https://app.vagrantup.com/boxes
and choose vagrant box that suits you best.
After that you need to create vagrant file by typing in console:

vagrant init ubuntu/xenial64

– ubuntu/xenial64 – stands for the name of the box you selected

Continue reading “Vagrant – setup LAMP container” »

Symfony – Create a service – the right way

Always create service interface for your service. This way you will have better structured code and phpunit testing will be real pleasure.
Also use dependency injection for your repositories in the service.

Service Interface Example

interface UserServiceInterface{
  public function getUsername();
  public function viewAll();
}

Service Example

class UserService implements UserServiceInterface
{

  private $entityManager;
  private $userRepository;

  public function __construct(EntityManager $entityManager, UserRepository $userRepository)
  {
    $this->entityManager = $entityManager;
    $this->userRepository = $userRepository;
  }

  public function viewAll()
  {
    return $this->userRepository->findAll();
  }
}

Repository Example

class UserRepository extends \Doctrine\ORM\EntityRepository
{
  public function __construct(EntityManager $em, Mapping\ClassMetadata $metadata = null)
  {
    parent::__construct(
      $em,
      $metadata == null ?
      new Mapping\ClassMetadata(User::class) :
      $metadata
    );
  }
}

Author: admin